Citrus > Cold Hardy Citrus

F2 citrange winter hardiness trial

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kumin:
The Conestoga River is a mile from my location. It's the name I chose for the group of survivors of a cold hardiness test undertaken in 2018/2019. The test involved 20,000 C-35 seedlings of which only 3,000 showed genetic diversity. A few dozen of these seedlings survived a low temperature of -12F. The survivors were further propagated and are presently undergoing additional trialing. One has fruited at this point and 2 additional plants have produced a few flowers.

bussone:

--- Quote from: kumin on February 22, 2023, 06:00:53 PM ---The Conestoga River is a mile from my location. It's the name I chose for the group of survivors of a cold hardiness test undertaken in 2018/2019. The test involved 20,000 C-35 seedlings of which only 3,000 showed genetic diversity. A few dozen of these seedlings survived a low temperature of -12F. The survivors were further propagated and are presently undergoing additional trialing. One has fruited at this point and 2 additional plants have produced a few flowers.

--- End quote ---

These are the ruby blood orange / poncirus crosses you tortured a few years back?

What are the fruits like? Its hard to find much on the fruit of rootstock hybrids.

kumin:
Only one of the seedlings has fruited at this point, although 2 additional trees have begun to flower for the first time. This particular fruit has acid flavors in addition to hints of Grapefruit taste. There are no grapefruit genetics involved, the faint bitterness likely came from the Poncirus parentage. The fruits are rather seedy, very thin rinded, subsequently will not keep for long periods.
Ripening is early as Poncirus. The tree is completely deciduous and has been acceptably hardy here in zone 6b.

Fruit with seeds removed.


The juice has an orange color.


Diluted to 30% juice/70%  water and sweetened it makes a desirable beverage.

 

Zitrusgaertner:

--- Quote from: kumin on February 22, 2023, 06:00:53 PM ---........... survived a low temperature of -12F. The survivors .......

--- End quote ---

-12 is -24,44C that's lower than some Poncirus trees would survive. Are you really sure?

kumin:




 Fahrenheit -11.8 and Celsius -24,5 photos. There were also -6F readings in the same week.
Poncirus did show a bit of injury on late season growth.

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